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Refraction

Modified on: Mon, 27 Jun, 2016 at 4:29 PM

Refraction is the change of direction of a propagating wave or radiation on
passing into a medium of different density (e.g. air - glass, glass- air). The
degree of deflection depends on the ratio of the refractive indices n(i) of the
two media. In general they depend on the wave length of the radiation. The
phenomenon of refraction is employed in optical equipment to guide the light
rays. In the case of the prism, on the other hand, it can be used to break down
the incident light into the colours of the spectrum.